arch/sparc/kernel/leon_kernel.c

   1 /*
   2  * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
   3  * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/module.h>
   8 #include <linux/errno.h>
   9 #include <linux/mutex.h>
  10 #include <linux/of.h>
  11 #include <linux/of_platform.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/of_device.h>
  14
  15 #include <asm/oplib.h>
  16 #include <asm/timer.h>
  17 #include <asm/prom.h>
  18 #include <asm/leon.h>
  19 #include <asm/leon_amba.h>
  20 #include <asm/traps.h>
  21 #include <asm/cacheflush.h>
  22
  23 #include "prom.h"
  24 #include "irq.h"
  25
  26 struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
  27 struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
  28 struct amba_apb_device leon_percpu_timer_dev[16];
  29
  30 int leondebug_irq_disable;
  31 int leon_debug_irqout;
  32 static int dummy_master_l10_counter;
  33
  34 unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
  35 unsigned int sparc_leon_eirq;
  36 #define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))
  37
  38 /* Return the IRQ of the pending IRQ on the extended IRQ controller */
  39 int sparc_leon_eirq_get(int eirq, int cpu)
  40 {
  41         return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
  42 }
  43
  44 irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
  45 {
  46         printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
  47         return IRQ_HANDLED;
  48 }
  49
  50 /* The extended IRQ controller has been found, this function registers it */
  51 void sparc_leon_eirq_register(int eirq)
  52 {
  53         int irq;
  54
  55         /* Register a "BAD" handler for this interrupt, it should never happen */
  56         irq = request_irq(eirq, sparc_leon_eirq_isr,
  57                           (IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL);
  58
  59         if (irq) {
  60                 printk(KERN_ERR
  61                        "sparc_leon_eirq_register: unable to attach IRQ%d\n",
  62                        eirq);
  63         } else {
  64                 sparc_leon_eirq = eirq;
  65         }
  66
  67 }
  68
  69 static inline unsigned long get_irqmask(unsigned int irq)
  70 {
  71         unsigned long mask;
  72
  73         if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
  74             || ((irq > 0x1f) && sparc_leon_eirq)) {
  75                 printk(KERN_ERR
  76                        "leon_get_irqmask: false irq number: %d\n", irq);
  77                 mask = 0;
  78         } else {
  79                 mask = LEON_HARD_INT(irq);
  80         }
  81         return mask;
  82 }
  83
  84 static void leon_enable_irq(unsigned int irq_nr)
  85 {
  86         unsigned long mask, flags;
  87         mask = get_irqmask(irq_nr);
  88         local_irq_save(flags);
  89         LEON3_BYPASS_STORE_PA(LEON_IMASK,
  90                               (LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
  91         local_irq_restore(flags);
  92 }
  93
  94 static void leon_disable_irq(unsigned int irq_nr)
  95 {
  96         unsigned long mask, flags;
  97         mask = get_irqmask(irq_nr);
  98         local_irq_save(flags);
  99         LEON3_BYPASS_STORE_PA(LEON_IMASK,
 100                               (LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
 101         local_irq_restore(flags);
 102
 103 }
 104
 105 void __init leon_init_timers(irq_handler_t counter_fn)
 106 {
 107         int irq;
 108         struct device_node *rootnp, *np;
 109         struct property *pp;
 110         int len;
 111         int cpu, icsel;
 112
 113         leondebug_irq_disable = 0;
 114         leon_debug_irqout = 0;
 115         master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
 116         dummy_master_l10_counter = 0;
 117
 118         /*Find IRQMP IRQ Controller Registers base address otherwise bail out.*/
 119         rootnp = of_find_node_by_path("/ambapp0");
 120         if (!rootnp)
 121                 goto bad;
 122         np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
 123         if (!np)
 124                 goto bad;
 125         pp = of_find_property(np, "reg", &len);
 126         if (!pp)
 127                 goto bad;
 128         leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
 129
 130         /* Find GPTIMER Timer Registers base address otherwise bail out. */
 131         np = of_find_node_by_name(rootnp, "GAISLER_GPTIMER");
 132         if (!np)
 133                 goto bad;
 134         pp = of_find_property(np, "reg", &len);
 135         if (!pp)
 136                 goto bad;
 137         leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)pp->value;
 138         pp = of_find_property(np, "interrupts", &len);
 139         if (!pp)
 140                 goto bad;
 141         leon3_gptimer_irq = *(unsigned int *)pp->value;
 142
 143         if (leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq) {
 144                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].val, 0);
 145                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].rld,
 146                                       (((1000000 / HZ) - 1)));
 147                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl, 0);
 148
 149 #ifdef CONFIG_SMP
 150                 leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
 151                 leon_percpu_timer_dev[0].irq = leon3_gptimer_irq+1;
 152
 153                 if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
 154                       (1<<LEON3_GPTIMER_SEPIRQ))) {
 155                         prom_printf("irq timer not configured with separate irqs\n");
 156                         BUG();
 157                 }
 158
 159                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].val, 0);
 160                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].rld, (((1000000/HZ) - 1)));
 161                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl, 0);
 162 # endif
 163
 164                 /*
 165                  * The IRQ controller may (if implemented) consist of multiple
 166                  * IRQ controllers, each mapped on a 4Kb boundary.
 167                  * Each CPU may be routed to different IRQCTRLs, however
 168                  * we assume that all CPUs (in SMP system) is routed to the
 169                  * same IRQ Controller, and for non-SMP only one IRQCTRL is
 170                  * accessed anyway.
 171                  * In AMP systems, Linux must run on CPU0 for the time being.
 172                  */
 173                 cpu = sparc_leon3_cpuid();
 174                 icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
 175                 icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
 176                 leon3_irqctrl_regs += icsel;
 177         } else {
 178                 goto bad;
 179         }
 180
 181         irq = request_irq(leon3_gptimer_irq,
 182                           counter_fn,
 183                           (IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
 184
 185         if (irq) {
 186                 printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
 187                        LEON_INTERRUPT_TIMER1);
 188                 prom_halt();
 189         }
 190
 191 # ifdef CONFIG_SMP
 192         {
 193                 unsigned long flags;
 194                 struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
 195
 196                 /* For SMP we use the level 14 ticker, however the bootup code
 197                  * has copied the firmwares level 14 vector into boot cpu's
 198                  * trap table, we must fix this now or we get squashed.
 199                  */
 200                 local_irq_save(flags);
 201
 202                 patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
 203
 204                 /* Adjust so that we jump directly to smpleon_ticker */
 205                 trap_table->inst_three += smpleon_ticker - real_irq_entry;
 206
 207                 local_flush_cache_all();
 208                 local_irq_restore(flags);
 209         }
 210 # endif
 211
 212         if (leon3_gptimer_regs) {
 213                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[0].ctrl,
 214                                       LEON3_GPTIMER_EN |
 215                                       LEON3_GPTIMER_RL |
 216                                       LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
 217
 218 #ifdef CONFIG_SMP
 219                 LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[1].ctrl,
 220                                       LEON3_GPTIMER_EN |
 221                                       LEON3_GPTIMER_RL |
 222                                       LEON3_GPTIMER_LD |
 223                                       LEON3_GPTIMER_IRQEN);
 224 #endif
 225
 226         }
 227         return;
 228 bad:
 229         printk(KERN_ERR "No Timer/irqctrl found\n");
 230         BUG();
 231         return;
 232 }
 233
 234 void leon_clear_clock_irq(void)
 235 {
 236 }
 237
 238 void leon_load_profile_irq(int cpu, unsigned int limit)
 239 {
 240         BUG();
 241 }
 242
 243
 244
 245
 246 void __init leon_trans_init(struct device_node *dp)
 247 {
 248         if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
 249                 struct property *p;
 250                 p = of_find_property(dp, "mid", (void *)0);
 251                 if (p) {
 252                         int mid;
 253                         dp->name = prom_early_alloc(5 + 1);
 254                         memcpy(&mid, p->value, p->length);
 255                         sprintf((char *)dp->name, "cpu%.2d", mid);
 256                 }
 257         }
 258 }
 259
 260 void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
 261
 262 void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
 263 {
 264         if (prom_amba_init &&
 265             strcmp(dp->type, "ambapp") == 0 &&
 266             strcmp(dp->name, "ambapp0") == 0) {
 267                 prom_amba_init(dp, nextp);
 268         }
 269 }
 270
 271 #ifdef CONFIG_SMP
 272
 273 void leon_set_cpu_int(int cpu, int level)
 274 {
 275         unsigned long mask;
 276         mask = get_irqmask(level);
 277         LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
 278 }
 279
 280 static void leon_clear_ipi(int cpu, int level)
 281 {
 282         unsigned long mask;
 283         mask = get_irqmask(level);
 284         LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
 285 }
 286
 287 static void leon_set_udt(int cpu)
 288 {
 289 }
 290
 291 void leon_clear_profile_irq(int cpu)
 292 {
 293 }
 294
 295 void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
 296 {
 297         unsigned long mask, flags, *addr;
 298         mask = get_irqmask(irq_nr);
 299         local_irq_save(flags);
 300         addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
 301         LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
 302         local_irq_restore(flags);
 303 }
 304
 305 #endif
 306
 307 void __init leon_init_IRQ(void)
 308 {
 309         sparc_init_timers = leon_init_timers;
 310
 311         BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
 312         BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
 313         BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
 314         BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);
 315
 316         BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
 317                         BTFIXUPCALL_NORM);
 318         BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
 319                         BTFIXUPCALL_NOP);
 320
 321 #ifdef CONFIG_SMP
 322         BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
 323         BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
 324         BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
 325 #endif
 326
 327 }
 328
 329 void __init leon_init(void)
 330 {
 331         of_pdt_build_more = &leon_node_init;
 332 }